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+package com.iden.common.util;
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+
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+import java.awt.Color;
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+import java.awt.Font;
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+import java.awt.Graphics2D;
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+import java.awt.image.BufferedImage;
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+import java.io.File;
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+import java.io.FileOutputStream;
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+import java.io.IOException;
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+import java.util.Arrays;
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+import java.util.Random;
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+
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+import javax.imageio.ImageIO;
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+
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+public class VerifyCodeUtil {
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+
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+ /**
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+ * 验证码难度级别 Simple-数字 Medium-数字和小写字母 Hard-数字和大小写字母
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+ */
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+ public enum SecurityCodeLevel {
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+ Simple, Medium, Hard
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+ };
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+
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+ /**
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+ * 产生默认验证码,4位中等难度
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+ *
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+ * @return
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+ */
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+ public static String getSecurityCode() {
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+ return getSecurityCode(4, SecurityCodeLevel.Medium, false);
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+ }
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+
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+ /**
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+ * 产生长度和难度任意的验证码
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+ *
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+ * @param length
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+ * @param level
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+ * @param isCanRepeat
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+ * @return
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+ */
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+ public static String getSecurityCode(int length, SecurityCodeLevel level, boolean isCanRepeat) {
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+ // 随机抽取len个字符
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+ int len = length;
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+ // 字符集合(--除去易混淆的数字0,1,字母l,o,O)
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+ char[] codes = {
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+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
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+ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
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+ };
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+ // 根据不同难度截取字符串
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+ if (level == SecurityCodeLevel.Simple) {
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+ codes = Arrays.copyOfRange(codes, 0, 10);
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+ } else if (level == SecurityCodeLevel.Medium) {
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+ codes = Arrays.copyOfRange(codes, 0, 36);
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+ }
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+ // 字符集和长度
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+ int n = codes.length;
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+ // 抛出运行时异常
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+ if (len > n && isCanRepeat == false) {
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+ throw new RuntimeException(String.format("调用SecurityCode.getSecurityCode(%1$s,%2$s,%3$s)出现异常," + "当isCanRepeat为%3$s时,传入参数%1$s不能大于%4$s", len, level, isCanRepeat, n));
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+ }
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+ // 存放抽取出来的字符
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+ char[] result = new char[len];
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+ // 判断能否出现重复字符
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+ if (isCanRepeat) {
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+ for (int i = 0; i < result.length; i++) {
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+ // 索引0 and n-1
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+ int r = (int) (Math.random() * n);
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+ // 将result中的第i个元素设置为code[r]存放的数值
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+ result[i] = codes[r];
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+ }
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+ } else {
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+ for (int i = 0; i < result.length; i++) {
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+ // 索引0 and n-1
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+ int r = (int) (Math.random() * n);
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+ // 将result中的第i个元素设置为code[r]存放的数值
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+ result[i] = codes[r];
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+ // 必须确保不会再次抽取到那个字符,这里用数组中最后一个字符改写code[r],并将n-1
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+ codes[r] = codes[n - 1];
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+ n--;
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+ }
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+ }
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+ return String.valueOf(result);
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+ }
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+
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+ /**
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+ * 生成验证码图片
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+ * @param securityCode
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+ * @return
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+ */
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+ public static BufferedImage createImage(String securityCode){
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+
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+ int codeLength = securityCode.length();//验证码长度
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+
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+ int fontSize = 18;//字体大小
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+
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+ int fontWidth = fontSize+1;
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+
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+ //图片宽高
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+
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+ int width = codeLength*fontWidth+6;
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+ int height = fontSize*2+1;
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+ //图片
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+
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+ BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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+
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+ Graphics2D g = image.createGraphics();
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+
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+ g.setColor(Color.WHITE);//设置背景色
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+
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+ g.fillRect(0, 0, width, height);//填充背景
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+
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+ g.setColor(Color.LIGHT_GRAY);//设置边框颜色
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+
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+ g.setFont(new Font("Arial", Font.BOLD, height-2));//边框字体样式
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+
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+ g.drawRect(0, 0, width-1, height-1);//绘制边框
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+
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+ //绘制噪点
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+
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+ Random rand = new Random();
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+
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+ g.setColor(Color.LIGHT_GRAY);
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+
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+ for (int i = 0; i < codeLength*6; i++) {
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+
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+ int x = rand.nextInt(width);
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+
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+ int y = rand.nextInt(height);
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+
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+ g.drawRect(x, y, 1, 1);//绘制1*1大小的矩形
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+
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+ }
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+
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+ //绘制验证码
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+
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+ int codeY = height-10;
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+
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+ g.setColor(new Color(19,148,246));
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+
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+ //Georgia 是个字体,如果想用中文要指定中文字体;eg:"宋体";
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+ //g.setFont(new Font("Georgia", Font.BOLD, fontSize));
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+ g.setFont(new Font("宋体", Font.BOLD, fontSize));
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+ for(int i=0;i<codeLength;i++){
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+ double deg=new Random().nextDouble()*20;
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+ g.rotate(Math.toRadians(deg), i*16+13,codeY-7.5);
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+ g.drawString(String.valueOf(securityCode.charAt(i)), i*16+5, codeY);
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+ g.rotate(Math.toRadians(-deg), i*16+13,codeY-7.5);
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+ }
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+
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+ g.dispose();//关闭资源
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+
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+ return image;
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+
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+ }
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+
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+ //测试
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+ public static void main(String[] args) throws IOException{
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+ //获得随机字符
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+ String securityCode = getSecurityCode();
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+ //输出随机字符
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+ System.out.println("===="+securityCode);
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+ //生成图片
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+ BufferedImage image = createImage(securityCode);
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+ //将生成的验证码图片以png(1.png)的格式输出到D盘 "D:\\1.png" == "D:/1.png"
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+ ImageIO.write(image, "png", new FileOutputStream(new File("D:\\1.png")));
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+ }
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+
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+
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+}
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